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Features November 2016 Issue

Low Clouds and Fog

Heavy winter radiation fog in the Columbia River valley often only affects low-lying valleys.

Low Clouds and Fog

It’s the time of year when “0SM FG” often begins paying a visit to your weather briefings. Let’s see what’s behind it and how to beat it.

November in the U.S. means the risks from thunderstorms have disappeared everywhere except the Gulf Coast region as a new set of problems emerge, from icing to turbulence to low clouds, fog, and high winds. A breakdown of accident statistics helps tell us where to focus our attention first. Using a 2003-2007 study, we find that where weather was a cause or contributing factor, low ceilings and visibility were the #2 factors, involved in 18 percent of all weather-related accidents.

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